If you're keen on iPhone games but haven't got cash to spare, you've come to the right place: We've rounded up the 18 best free iPhone games for your delectation, running the gamut from fighting and sports games to puzzles and RPGs.

It's worth mentioning first of all, mind you, that free games aren't always the bargain they first appear -- beware of false economies, scam games, games crammed with annoying in-app payments and adverts, and various other irritations that often beset free games. We discuss some of these issues in 'Freemium is the worst thing in the history of gaming: a rant' and 'Why apps need to be more expensive.'

And if you're looking for games for kids, make sure they know about the dangers and expenses of in-app purchases. We'd recommend the judicious use of parental controls to avoid an unpleasant bill.